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LZFCompressedStreamOutput.java
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LZFCompressedStreamOutput.java
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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.common.compress.lzf;
import com.ning.compress.BufferRecycler;
import com.ning.compress.lzf.ChunkEncoder;
import com.ning.compress.lzf.LZFChunk;
import com.ning.compress.lzf.util.ChunkEncoderFactory;
import org.elasticsearch.common.compress.CompressedStreamOutput;
import org.elasticsearch.common.io.stream.StreamOutput;
import java.io.IOException;
public class LZFCompressedStreamOutput extends CompressedStreamOutput<LZFCompressorContext> {
private final BufferRecycler recycler;
private final ChunkEncoder encoder;
public LZFCompressedStreamOutput(StreamOutput out) throws IOException {
super(out, LZFCompressorContext.INSTANCE);
this.recycler = BufferRecycler.instance();
this.uncompressed = this.recycler.allocOutputBuffer(LZFChunk.MAX_CHUNK_LEN);
this.uncompressedLength = LZFChunk.MAX_CHUNK_LEN;
this.encoder = ChunkEncoderFactory.safeInstance(recycler);
}
@Override
public void writeHeader(StreamOutput out) throws IOException {
// nothing to do here, each chunk has a header of its own
}
@Override
protected void compress(byte[] data, int offset, int len, StreamOutput out) throws IOException {
encoder.encodeAndWriteChunk(data, offset, len, out);
}
@Override
protected void doClose() throws IOException {
byte[] buf = uncompressed;
if (buf != null) {
uncompressed = null;
recycler.releaseOutputBuffer(buf);
}
encoder.close();
}
}